SCPE_NXM         1573 src/dps8/dps8_cpu.c         return SCPE_NXM;
SCPE_NXM         1586 src/dps8/dps8_cpu.c     if (addr >= MEMSIZE) return SCPE_NXM;
SCPE_NXM         6556 src/simh/scp.c             reason = SCPE_NXM;
SCPE_NXM         6647 src/simh/scp.c             return SCPE_NXM;